Welcome to the store! 1. 3 IN 1 FUNCTION: With optical power meter, LED light, and red light source functions, the detection distance of the red light source is 10 km. 2. GOOD PERFORMANCE: The meter has a sensitive chip and solid internal structure, low battery consumption, 40 hours of continuous operation. 3. 10 WAVELENGTHS: Supports wavelengths of 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, and 1650nm. 4. APPLICABLE ADAPTER: The power meter is compatible with SC FC ST adapter, meeting most communication technology maintenance requirements. 5. EASY TO USE: The optical tester has a compact size, with a clear display, button operation, which is convenient and practical. Item Type: Optical Power Meter Material: ABS Red Light Source Detection Distance: 10 km Power Supply: 2 x AAA battery (not included) Wavelength Range: 850-1650nm Standard Wavelength: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nm Display Resolution: Linear Display: 0.1% Logarithmic Display: 0.01dBm Working Temperature: -10-60℃ Storage Temperature: -25-70℃ Automatic Shutdown Time: 10 minutes Battery Continuous Working Time: At least 40 hours 1 x Optical Power Meter 1 x Hanging Rope 1 x User Manual Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!